矿物质元素的动态模式在分解过程期间我们为七普通华盖种在的 reinvestigated 一副热带常绿树借助于在 2 年的崽袋子技术的阔叶的森林。学习的种类为在学习区域的植被是代表性的并且在他们的崽的化学质量显著地不同。没有重要关系在分...矿物质元素的动态模式在分解过程期间我们为七普通华盖种在的 reinvestigated 一副热带常绿树借助于在 2 年的崽袋子技术的阔叶的森林。学习的种类为在学习区域的植被是代表性的并且在他们的崽的化学质量显著地不同。没有重要关系在分解率之间被发现(百分比干燥集体留下和分解常数 k ) 并且起始的元素集中。然而，在为大多数盒子的在留下的崽的干燥集体留下和矿物质元素集中的百分比之间有重要关联。在分解过程的元素活动性的等级如下：Na= K 】
Mg ≧ Ca 】
N ≧ Mn ≧ Zn ≧ P 】
Cu 】
】
艾尔 】
】
Fe。当分解继续了， K 和 Na 的集中在所有种类减少了。当另外的元素(Zn， Cu，艾尔，和 Fe ) 的集中与在不同种类揭示了一个不同模式的 Mn 的例外为所有种类增加了时，钙和 Mg 也在集中，但是随分解的起始的阶段的永久增加减少了。在里面大多数种类，微型元件(Cu，艾尔，和 Fe ) 显著地在崽袋子孵化的结束在绝对数量增加了，它能被归功于到大程度到不能生活的固定的机制到腐殖的物质而非生物固定。展开更多
We used a litterbag method to investigate litter decomposition and related soil degradative enzyme activities across four seasons in a broad-leaved forest and a coniferous forest on Zijin Mountain in sub-tropical Chin...We used a litterbag method to investigate litter decomposition and related soil degradative enzyme activities across four seasons in a broad-leaved forest and a coniferous forest on Zijin Mountain in sub-tropical China. Across four seasons, we quantified litter mass losses, soil pH values, and related soil degradative enzyme activities. Litter decomposition rates differed significantly by season. Litter decomposi- tion rates of broadleaf forest leaves were higher than for coniferous for- ests needles across four seasons, and maximal differences in litter de- composition rates between the two litter types were found in spring.展开更多
Through the long-term plot study on the litter and its decomposition in the evergreen broad-leaved forest ecosystem in Hangzhou for more than two years,it was resulted that the annual litter production was 5.85 t ha^-...Through the long-term plot study on the litter and its decomposition in the evergreen broad-leaved forest ecosystem in Hangzhou for more than two years,it was resulted that the annual litter production was 5.85 t ha^-1,most of which was the fallen leave (79.5 percent) and the withered branches and fruits were far less (7.1 and 13.4 percents respectively).The dynamics of the fallen litter was shown as a curve of two-peak pattern which appeared in April and September each year.The half-life of the litter was 1.59 years.The decay rate of the litter attenuted as an exponential function.The annual amount of the nutrient returned to the ground through the litter was as large as 223.69kg ha^-1.The total current amount of the litter on the ground was 7.47t ha^-1.The decay rate in the first half of a year was 45.18 percent.This ecosystem remained in the stage of litter increasing with time.展开更多
Background: Decomposition process controls the release and the availability of essential nutrients, which affects the structure and the functioning of plant communities. Freshwater reservoirs are largely known to have...Background: Decomposition process controls the release and the availability of essential nutrients, which affects the structure and the functioning of plant communities. Freshwater reservoirs are largely known to have impacts on the water quality, especially during the first phases of filling. The aim of the study was to conduct a nutrient release experiment where decomposition of fresh leaves and litter from vegetation of a low dry tropical forest was flooded. Selected species were Leguminosae species Albizia glabripetala (H. S. Irwin) G. P. Lewis & P. E. Owen (AG), Bauhinia aculeata L. (BA), Centrolobium paraense Tul. (CP) and Piptadenia leucoxyllon Barneby & J. W. Grimes (PL). Freshwater decomposition experiments were carried out at 50 cm depth inside nine floating containers in a protected area of the reservoir: litter (HJ), leaves of AG and BA (E2), and CP and PL (E3) were used. It was over 20 weeks period. Every week for two months and at week 20, a bag of each sample was extracted for analysis of Carbon, Ca, Mg, Na, K, P and S. Results: Results indicate that residual dry mass decreased by 71% for HJ, 81.4% for E2, and more than 86.8% for E3 after twenty weeks. The higher content of carbon (%) at the beginning of the experiment was E2 > E3 > HJ. After 20 weeks, the percentage of carbon loss was 2.09% for HJ, 3.02% for E2, and 1.69% for E3. S decreased between 50% - 60% during the first week;at 20 weeks, the remaining amount of S was 13% for HJ and E3 and 7% for E2. P showed a different pattern, where the second week was more important for the release. HJ and E3 followed the pattern of nutrient release: K > Mg > Na > Ca while E2 was K > Ca > Mg > Na. Conclusions: P and S release depends on the time of submergence and the species. Fresh leaves decay faster than necromass. Nutrient loss is higher than 50% for the three first weeks and seems constant between week 8 - 20. C and S concentrations incorporated in the reservoir can result in a high release of gases CH<sub>4</sub> and S<sub>2</sub> to the atmosphere. This study is the first publication in relation to nutrient release from the submergence of species in dry tropical forests.展开更多
文摘矿物质元素的动态模式在分解过程期间我们为七普通华盖种在的 reinvestigated 一副热带常绿树借助于在 2 年的崽袋子技术的阔叶的森林。学习的种类为在学习区域的植被是代表性的并且在他们的崽的化学质量显著地不同。没有重要关系在分解率之间被发现(百分比干燥集体留下和分解常数 k ) 并且起始的元素集中。然而，在为大多数盒子的在留下的崽的干燥集体留下和矿物质元素集中的百分比之间有重要关联。在分解过程的元素活动性的等级如下：Na= K 】
Mg ≧ Ca 】
N ≧ Mn ≧ Zn ≧ P 】
Cu 】
】
艾尔 】
】
Fe。当分解继续了， K 和 Na 的集中在所有种类减少了。当另外的元素(Zn， Cu，艾尔，和 Fe ) 的集中与在不同种类揭示了一个不同模式的 Mn 的例外为所有种类增加了时，钙和 Mg 也在集中，但是随分解的起始的阶段的永久增加减少了。在里面大多数种类，微型元件(Cu，艾尔，和 Fe ) 显著地在崽袋子孵化的结束在绝对数量增加了，它能被归功于到大程度到不能生活的固定的机制到腐殖的物质而非生物固定。
基金supported by the National Natural Science Foundation of China(30870419,40971151)Strategic Priority Research Program Climate Change:Carbon Budget and Related Issues of the Chinese Academy of Sciences(XDA05050204)
文摘We used a litterbag method to investigate litter decomposition and related soil degradative enzyme activities across four seasons in a broad-leaved forest and a coniferous forest on Zijin Mountain in sub-tropical China. Across four seasons, we quantified litter mass losses, soil pH values, and related soil degradative enzyme activities. Litter decomposition rates differed significantly by season. Litter decomposi- tion rates of broadleaf forest leaves were higher than for coniferous for- ests needles across four seasons, and maximal differences in litter de- composition rates between the two litter types were found in spring.
基金Project supported by the Laboratory of Material Cycling in Pedosphere, Insitute of Soil Science, Chinese Academy of Sciences.
文摘Through the long-term plot study on the litter and its decomposition in the evergreen broad-leaved forest ecosystem in Hangzhou for more than two years,it was resulted that the annual litter production was 5.85 t ha^-1,most of which was the fallen leave (79.5 percent) and the withered branches and fruits were far less (7.1 and 13.4 percents respectively).The dynamics of the fallen litter was shown as a curve of two-peak pattern which appeared in April and September each year.The half-life of the litter was 1.59 years.The decay rate of the litter attenuted as an exponential function.The annual amount of the nutrient returned to the ground through the litter was as large as 223.69kg ha^-1.The total current amount of the litter on the ground was 7.47t ha^-1.The decay rate in the first half of a year was 45.18 percent.This ecosystem remained in the stage of litter increasing with time.
文摘Background: Decomposition process controls the release and the availability of essential nutrients, which affects the structure and the functioning of plant communities. Freshwater reservoirs are largely known to have impacts on the water quality, especially during the first phases of filling. The aim of the study was to conduct a nutrient release experiment where decomposition of fresh leaves and litter from vegetation of a low dry tropical forest was flooded. Selected species were Leguminosae species Albizia glabripetala (H. S. Irwin) G. P. Lewis & P. E. Owen (AG), Bauhinia aculeata L. (BA), Centrolobium paraense Tul. (CP) and Piptadenia leucoxyllon Barneby & J. W. Grimes (PL). Freshwater decomposition experiments were carried out at 50 cm depth inside nine floating containers in a protected area of the reservoir: litter (HJ), leaves of AG and BA (E2), and CP and PL (E3) were used. It was over 20 weeks period. Every week for two months and at week 20, a bag of each sample was extracted for analysis of Carbon, Ca, Mg, Na, K, P and S. Results: Results indicate that residual dry mass decreased by 71% for HJ, 81.4% for E2, and more than 86.8% for E3 after twenty weeks. The higher content of carbon (%) at the beginning of the experiment was E2 > E3 > HJ. After 20 weeks, the percentage of carbon loss was 2.09% for HJ, 3.02% for E2, and 1.69% for E3. S decreased between 50% - 60% during the first week;at 20 weeks, the remaining amount of S was 13% for HJ and E3 and 7% for E2. P showed a different pattern, where the second week was more important for the release. HJ and E3 followed the pattern of nutrient release: K > Mg > Na > Ca while E2 was K > Ca > Mg > Na. Conclusions: P and S release depends on the time of submergence and the species. Fresh leaves decay faster than necromass. Nutrient loss is higher than 50% for the three first weeks and seems constant between week 8 - 20. C and S concentrations incorporated in the reservoir can result in a high release of gases CH<sub>4</sub> and S<sub>2</sub> to the atmosphere. This study is the first publication in relation to nutrient release from the submergence of species in dry tropical forests.
